Welding Industry Annual Energy Use

I am currently working on an energy and environmental profile of the welding industry. The idea is to develop baseline process information and energy data - I am at my wit's end trying to find information! 

I am looking for data on:

-Energy requirements of different welding processes.

-Qualitative and quantitative information on air emissions, water requirements, effluents, and solid wastes generated during welding.

Any help would be great!